kennknowles commented on a change in pull request #15778:
URL: https://github.com/apache/beam/pull/15778#discussion_r760642640
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File path: website/www/site/content/en/documentation/basics.md
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@@ -365,6 +373,76 @@ For more information about runners, see the following
pages:
* [Choosing a Runner](/documentation/#choosing-a-runner)
* [Beam Capability Matrix](/documentation/runners/capability-matrix/)
+### Window
+
+Windowing subdivides a `PCollection` into _windows_ according to the timestamps
+of its individual elements. Windows enable grouping operations over unbounded
+collections by dividing the collection into windows of finite collections. A
+windowing function tells the runner how to assign elements to an initial
window,
Review comment:
You are 100% correct on all counts. The `WindowFn` takes an element as
input and returns zero or more windows. The element is (conceptually)
duplicated into each of those windows. So to be clear: in a PCollection each
element is in precisely 1 window. But the function that says which window(s) to
put it in can specify multiple, or none.
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